Senior IT Systems Engineer

US, Remotefull timeRemote

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Senior IT Systems Engineer at horizon3ai · LumiJobs

senior

$142k–$162k

H1B: no

horizon3ai Senior IT Systems Engineer responsible for securing and administering identity, email, and network infrastructure. Collaborates with Security and Help Desk teams to maintain security standards and resolve escalated issues.

Responsibilities

We are seeking a security-minded IT Systems Engineer with a genuine passion for networking — someone equally comfortable hardening identity and email infrastructure as they are managing routing and firewall policy. This role is roughly 60% security, identity, and email systems and 40% network engineering.
This role will be responsible for.....
Administer and secure Okta (or equivalent IdP/SSO), managing authentication policies, access provisioning, and integration with downstream applications
Architecting, Administering and secure the company email/collaboration platform, including mail flow rules, spam/phishing filtering, DKIM/DMARC/SPF configuration, and data loss prevention policies
Own operations, monitoring, and incident response for network, email and identity security controls including firewall policy, and threat detection
Triage incidents and remediate or escalate per incident response procedures
Collaborate across teams (Security and Help Desk) to resolve escalated connectivity issues, support onboarding/offboarding, and ensure infrastructure remains aligned with security standards.
Evaluate and recommend improvements to identity architecture, email security posture, and related tooling
Administer and maintain network infrastructure: switches, routers, firewalls, and wireless access points while also supporting a distributed workforce, including capacity planning and performance monitoring
Design and implement network changes (VLANs, routing, firewall rule changes) with minimal disruption to business operations
Maintain accurate documentation of network topology, configurations, and email/identity security architecture
Manage vendor relationships and support contracts for network, firewall, identity, and email security tooling

Qualification

Minimum Education and ExperienceRequired Tech Stack ExperienceIdentity/SSO platform (eEnterprise firewalls (eRouting and switching (eNetwork monitoring toolsWhat Sets You Apart?

Required

Must be able to scope and manage moderately complex projects end-to-end with little to no direction
Minimum Education and Experience
3–5 years of experience in systems administration, identity/security engineering, or network administration
Experience supporting a distributed or remote-first workforce
Required Tech Stack Experience
Identity/SSO platform (e.g., Okta, or similar)
Email security gateway / anti-phishing tooling (e.g., Proofpoint, Mimecast, or similar)
Email/collaboration platform (Google Workspace or Microsoft 365, or similar)
Enterprise firewalls (e.g., Palo Alto, Fortinet, or similar)
Routing and switching (e.g., Cisco, Meraki, or similar)
Network monitoring tools
What Sets You Apart?

Benefits

Dental
Vision
Equity/RSU
Parental Leave
Flexible Work

Company

horizon3ai

View company page

Source: ashby

Active within the past hour

Remote-friendly

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Must-Have Skills for This Role

OktaIdPSSOEmail SecurityDKIMDMARC

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